$ git clone -n https://src.fedoraproject.org/rpms/rust-nix0.24.git /var/lib/mock/f40-build-2082885-49873/root/chroot_tmpdir/scmroot/rust-nix0.24
Cloning into '/var/lib/mock/f40-build-2082885-49873/root/chroot_tmpdir/scmroot/rust-nix0.24'...
$ git fetch origin b00e40fb14741b4f384062dafe98512e1b8bcd93:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-nix0.24
 * [new ref]         b00e40fb14741b4f384062dafe98512e1b8bcd93 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b00e40f Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild